1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : RAMVARS struct containing BIOS variables stored in RAM. |
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3 | %ifndef RAMVARS_INC |
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4 | %define RAMVARS_INC |
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5 | |
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6 | ; Segment when RAMVARS is stored to top of interrupt vectors. |
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7 | SEGMENT_RAMVARS_TOP_OF_INTERRUPT_VECTORS EQU 30h |
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8 | |
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9 | |
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10 | ; Variables for translating drive numbers. |
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11 | struc XLATEVARS |
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12 | .bFDSwap resb 1 ; Floppy Drive to swap to 00h and vice versa |
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13 | .bHDSwap resb 1 ; Hard Drive to swap to 80h and vice versa |
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14 | .bRecurCnt resb 1 ; INT 13h recursion counter for drive translation |
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15 | resb 1 ; For WORD alignment |
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16 | endstruc |
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17 | |
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18 | ; RAM Variables. |
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19 | ; Variables should be kept to minimum since they might be located |
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20 | ; at the top of interrupt vectors. |
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21 | struc RAMVARS |
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22 | .fpOldI13h resb 4 ; Far pointer to old INT 13h handler |
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23 | |
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24 | .dwI13DIDS: ; Temporary DI and DS storages when calling... |
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25 | .wI13hDI: ; ...previous INT 13h handler |
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26 | .wIdeBase resb 2 ; Base port address for currently handled controller |
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27 | |
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28 | .wI13hDS: |
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29 | .wTimeoutCounter resb 2 |
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30 | |
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31 | .wDrvCntAndFirst: |
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32 | .bDrvCnt resb 1 ; Number of drives handled by this BIOS |
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33 | .bFirstDrv resb 1 ; Number of first drive for this BIOS |
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34 | |
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35 | ; Variables for drive number translation |
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36 | .xlateVars resb XLATEVARS_size |
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37 | endstruc |
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38 | |
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39 | ; Full mode RAM variables. |
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40 | struc FULLRAMVARS |
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41 | .ramVars resb RAMVARS_size |
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42 | .wSign resb 2 ; FULLRAMVARS signature for finding segment |
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43 | .drv80hCompDPT resb COMPATIBLE_FDPT_size |
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44 | .drv81hCompDPT resb COMPATIBLE_FDPT_size |
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45 | endstruc |
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46 | |
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47 | W_SIGN_FULLRAMVARS EQU "fR" ; FULLRAMVARS signature |
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48 | |
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49 | |
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50 | %endif ; RAMVARS_INC |
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